Wealth tax, in India, is levied under the Wealth-tax Act, 1957. NRIs are taxes only in respect of their wealth in India. (Foreign wealth being entirely exempt from tax).
The minimum threshold limit for wealth tax is INR 30 lakhs. The wealth-tax is payable @1% on the net wealth exceeding INR 30 Lakhs.A person is required to file his return of wealth if the wealth for the current year exceeds INR 30 lakhs.
Remaining procedure is same as of filing ROI under Income Tax Act, 1961.